Acylation process
AssigneeRhodia Acetow GmbH
InventorsJana Lubkoll, Armin Stein
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Abstract
The invention concerns a process for the manufacture of an acylated polymer composition comprising amylose and/or amylopectin, comprising a pre-treatment step in the presence of an acid, a salt and a polycarboxylic acid, subsequent acylation and, preferably, a post-treatment step with an acid. The products obtained are useful as additives in inks, varnishes, lacquers, coatings, thickeners, adhesives or binders.
Claims22
An acylated polymer composition comprising acylated amylose and/or acylated amylopectin, which is made by a process comprising the following steps:
- (a) pre-treating a polymer composition comprising amylose and/or amylopectin with an aqueous phase, the aqueous phase comprising at least one salt, at least one polycarboxylic acid, and one additive selected from the group consisting of at least one acid A having a pKa of equal to or less than 4.8 at 25° C. and an enzyme;
- (b) reacting the pre-treated polymer composition with an acylating agent to provide an acylated polymer composition comprising acylated amylose and/or acylated amylopectin;
- and
- (c) reacting the acylated polymer composition obtained in step (b) with at least one acid A′ with a pKa of equal to or less than 4.8 at 25° C., in the presence of water.
An acylated polymer composition comprising acylated amylose and/or acylated amylopectin, which is made by a process comprising the following steps:
- (a) pre-treating a polymer composition comprising amylose and/or amylopectin with an aqueous phase comprising at least one salt, at least one polycarboxylic acid, and one additive selected from the group consisting of at least one acid A having a pKa of equal to or less than 4.8 at 25° C. and an enzyme;
- (b) reacting the pre-treated polymer composition with an acylating agent to provide an acylated polymer composition comprising acylated amylose and/or acylated amylopectin;
- and
- (c) reacting the acylated polymer composition obtained in step (b) with at least one acid A′ with a pKa of equal to or less than 4.8 at 25° C., in the presence of water,
- wherein the viscosity of polymer composition is equal to or greater than 77 mPas (10 w % in Triacetin at 30° C.).
A process for manufacturing an acylated polymer composition comprising acylated amylose and/or acylated amylopectin, having a viscosity of equal to or greater than 77 mPas (10 w % in Triacetin at 30° C.), which comprises:
- (a) pre-treating a polymer composition comprising amylose and/or amylopectin with an aqueous phase, the aqueous phase comprising at least one salt, at least one polycarboxylic acid, and one additive selected from the group consisting of at least one acid A having a pKa of equal to or less than 4.8 at 25° C. and an enzyme;
- and
- (b) reacting the pre-treated polymer composition with an acylating agent to provide an acylated polymer composition comprising acylated amylose and/or acylated amylopectin.
Dependencies are inferred from the claim text.